Excavating shovel



LMLFJSQ Feb. 2,- p BURKE EXCAVATING SHOVEL Filed April 22, 1929 2 SheetsSheeC 5932. P. BURKE EXCAVATING SHOVEL 2 Sheets-Sheet 2 Filed April- 22, 1929 gmento'o ,Lw F'QWA WU I Q Patented Feb. 2, 1932 7 entr es stares;

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b PAUL BURKE, OF GREEN BAY, WISCONSIN, ASSIGNOR T NORTHWEST ENGINEERING CORPORATION, GREEN] BAY, WISCONSIN, A CORPORATION OF WISCONSIN EXGAVATING snovnil Application filed April 22, 1925 SerialNo. 357,052.

. The invention relates to power shovels.

In shovels provided with long dipper sticks it is desirable to effect a change in ratio of the thrusting tension during operation wherei ordinary digging operation. According to the present invention the holsting and thrusting means embodies a-pair of cables associated with a hoisting drum and variable dlameter,

cable-actuating means whereby the dipper stick in its extended position is subjected to a,

greater ratio of tensions between the cables than obtains 1n the posltions of lesser degree of extension.

A further object of the invention is toprovide a simple and practical constructionfor accomplishing the aboveobjects in which the drums are located in a position that will not decrease the strength of the boom and may be sufiiciently wide to efiiciently accomplish.

a their intended purpose and one in which the,

use of the ordinary racks and pinions with their increase initial cost and upkeep is eliminated.

The invention further consists in thesev 1 eral features hereinafter set forth and more particularly defined by claims at the conclusion hereof. i

In the drawings Fig. 1 is aside elevation view of an excavating shovel embodying the invention;

Fig. 2 is a plan view thereof. I

In the drawings the numeral 4 designates the boom, which may be of any suitable construction, vertically pivotally attached, as at 5, to the rotating base 6 of the machine, which base is of well known construction mounted on a travelling base 7 equipped with-endless propelling treads 8 driven by a prime mover (not shown) mounted on therotating base. The drums 9 and 10 may be of any well known construction and are loose on a shaft llto which they'are adapted to be drivingly connected by suitable clutches and said drums are also equipped with suitable brakes to control their operation. Motion from the prime mover is transmitted to the shaft 11 from a drive shaft 12 carrying a pinion 13' meshing with a gear 14 on the shaft 11.

Mounted upon the boom 4 in spaced relation to each other are a pair of drums15 and 16 whose pivot shafts are connected together by gears 17 and 18. r The boom is adapted to be raised or loweredfa'nd held in various positions of vertical adjustment by any well known means, such as. the cable 5 shown in my United States Patent No. 1,536,609, dated May 5,1925. v

A shipper shaft 19 is secured in side cast-' ings 20 on the boom and the saddle blocks or handle guides 21 are mounted to swing on said shaft. The dipper handle or stick 22 is preferably of the divided type, that is, composed of two sections, each slidably mounted in its respective saddle block and adapted to swing therewith about the shaft 19 and carries a dipper or shovel 23 of any suitable stick. I

One section 27 of the hoisting and-thrusting cable passes from the drum 9 outwardly under a sheave 28 on the shipper shaft, thence around a boom point sheave 29, thenceidown and around apadlock sheave 80 connected to the dipper, thence upwardly over the boom point sheave 31 and thence to the drum 15 on which it is dead ended; g I The other section 2326f the hoisting and thrusting cable which is wound on the drum l6 passes therefrom under a sheave 32 rotatively mounted on the shipper shaft, thencearound dipper stick cap sheave 33 mounted at the inner end of the dipper stick, thence down to its dead end connector 34, which is pivotally mounted on the shipper shaft 19.

It will be noted that the drums 15 and 16 have cable grooves formed therein of varyingpitch diameters with connecting grooves 35 formed therein between the larger diameter grooves 36 and the smaller diameter grooves 37. V

Vith this construction when the drum 10 is prevented from turning by its brake, thereby holding the cable 24, and the cable 27 is pulled in by winding it up on the drum 9, the dipper moves approximately in the arc of a circle of which the shipper shaft is the center. The dipper having been drawn in toward the machine and lowered upon the material to be excavated, as shown in dotted lines in Fig. 1, and with the brake on drum 10 released to allow cable 24 to pay out, cable 27 is wound in, causing the dipper to swing relative to its pivot on the shipper shaft and at the same time shift outwardly with respect to the boom through the saddle blockby reason of the pulling efiect exerted on the upper end of the dipper stick by the bight of the cable 32 which is then being shortened by being wound u on the drum 16 through the turning of sai drum by the gear connection 18, 17, with the drum 15 which is being turned by the tension exerted thereon by the cable 27. This outward shifting of the dipper handle crowds the dipper outwardly into the material to be excavated and during this time the cable 32 is being wound up on the portion of the drum 16 of smaller diameter. Thereafter, as the hoisting proceeds the cable 32 passes from the smaller diameter 01. drum 16 to the larger diameter at a time when the dipper stick is in raised position and the ratio of tension in the cables 32 and 27 then increases so that the dipper stick may be readily thrust outwardly to an extended position beyond the boom. Raising the dipper and dipper handle to permit lowering it to the desired working position is accomplished by pulling in on the back haul cable 24 with the brake on drum 9.

From the foregoing description it will be noted that I have provided a construction in which the dipper and its handle may be thrust outwardly with varying degrees of tension between the cables 27 and 32 or inwardly by the cable 24.

The boom 4 is a box type boom and it will be noted that none of the mechanism proper occupies any of the space bounded by the main members of the boom, the shipper shaft and the members associated therewith, and the drums 15 and 16 being mounted on the outside of said boom.

I desire it to be understood that this invention is not to be limited to any specific form or arrangement of parts except insofar as such limitations are specified in the claims.

What I claim as my invention is:

1. In an excavating machine, the combination with a supporting boom, of a dipper and dipper handle mounted thereon for swinging and shifting movements relative thereto, a pair of hoisting and thrusting cables, one of said cables being associated with the dipper and the other of said cables being associated with the inner end of the dipper handle, and means operatively connecting said cables together for varying the ratios of tensions between said cables during the digging cycle whereby the dipper handle in its extended position is subjected to a greater ratio of tension between said cables than obtains in its positions of lesser degree of extension.

2. In an excavating machine, the combination with a supporting boom, of a dipper and dipper handle mounted thereon for swinging and shifting movements relative thereto, a pair of hoisting and thrusting cables, one of said cables being associated with the dipper and the other of said cables being associated with the inner end of the dipper handle, means operatively connecting said cables together for varying the ratios of tensions between said cables during the digging cycle whereby, the dipper handle in its extended position is subjected to a greater ratio of tensions between the cables than obtains in its positions of lesser degree of extension, and a separately controlled cable associated with the outer end of the dipper handle for shifting the dipper and its handle inwardly.

3. In an excavating machine, the combination with a supporting boom, of a dipper and dipper handle mounted thereon for swinging and shifting movements relative thereto, a pair of hoisting and thrusting cables, one of said cables being asssociated with the dipper and t ie other of said cables being associated with the inner end or" the dipper handle, a pair of interconnected drums, arranged in parallel. with which said cables are respectively associated, each of said drums having interconnected cable guide grooves of different diametersfOr varying the tensions between said cables whereby the dipper handle in its extended position is subjected to a greater ratio of tensions between said cables than obtains in its positions of a lesser degree of extension.

4. In an excavating machine, the combination with a supporting boom, of a dipper and dipper handle mounted thereon for swinging and shifting in vements relative thereto, a pair of hoisting and thrusting cables, one of said cables being associated with the dipper and the other of said cables being associated with the inner end of the dipper handle, a pair of intergeared drums with which said cables are associated, each of said drums having interconnected cable guide grooves of different diameters for varying the tensions between the cables whereby the dipper handle in its extended position is subjected to a greater ratio of tensions between the cables than obtains in its positions of lesser degrees of extension, and a separately controlled cable associated with the outer-end of the dipper handle for shifting the dipper and its handle inwardly.

5. In an excavatingmachine, the combination with a supporting box boom, of a dipper and dipper handle, means exterior of said In testimony whereof I aflix my signature.

boom for mounting said dipper and dipper handle for swinging and shifting movement relative thereto, a pair of hoisting and thrusting cables, one of said cables being associated with the dipper and'the other of said cables being associated with the inner'end of the dipper handle, and drum means, mounted on the outside of the boom, operatively connecting said cables together for varying the ratios of tension between the cables during the digging cycle whereby the dipper handle in its extended position is subjected to a greater ratio of tensions between said cables than obtains in its positions of lesser degree of extension. 6. In an excavating machine, the combination with a supporting boom, of a dipper and dipper handle mounted thereon for swinging and shifting movements relative thereto, a pair of hoisting and thrusting cables, one of said cables being associated with the dipper for hoisting the same, the other of said cables for thrusting the dipper handle outwardly, and means operatively connecting said cables together for varying the ratios of tensions between said cables during the digging cycle whereby the dipper handle in its extended position is subjected to a greater ratio of tension between said cables than obtains in its positions of lesser degree of extension.

7. In an excavating machine, the combination with a supporting boom, of a dipper and dipper handle mounted thereon for swinging and shifting movements relative thereto, a pair of hoisting and thrusting cables, one of said cables being associated with the dipper for hoisting the same, the other of said cables vfor thrusting the dipper handle outwardly, and a pair of drums with which said cables are associated for varying the ratios of tensions between said cables during the digging cycle whereby the dipper handlein its extended position is subjected to a greater ratio of tension between said cables than obtains in its positions of lesser degree of extension.

8. In an excavating machine, the combination with a supporting boom, of a dipper and dipper handle mounted thereon for swinging and shifting movements relative thereto, a pair of hoisting and thrusting cables, one of said cables being associated with the dipper and the other of said cables being associated with the inner end ofthe dipper handle, a

whereby the dipper handle in its extended position is subjected to a greater ratio of tensions between said cables than obtains in its positions of lesser degree of extension.

PAUL BURKE. 

